Write an application to the principal of your college for leave because you are ill and the doctor has advised you complete rest.
Most respectfully, I beg to say that I have been suffering from fever since last night. So I attend the college, I therefore, request you to grant me leave for a week, from 7th to 13th August, 20…… as the doctor has advised me complete rest.
I shall be highly obliged.
Date : 7th August, 20……